Travel document is in Virginia (4)
I believe the answer is:
visa
'travel document' is the definition.
(I've seen this in another clue)
'is in virginia' is the wordplay.
'in' means one lot of letters goes inside another.
'virginia' becomes 'va' (US state abbreviation).
'is' put within 'va' is 'VISA'.
(Other definitions for visa that I've seen before include "Authorisation to enter a country" , "Endorsement made in a passport" , "travel authority" , "It allows the bearer to enter the country issuing it" , "Travel pass" .)